We study the regularity of the induced foliation of a Levi-flat hypersurface in Cn, showing that the foliation is as many times continuously differentiable as the hypersurface itself. The key step in the proof given here is the construction of a certain family of approximate plurisubharmonic defining functions for the hypersurface in question.

In this paper we introduce paraquaternionic CR-submanifolds of almost paraquaternionic hermitian manifolds and state some basic results on their differential geometry. We also study a class of semi-Riemannian submersions from paraquaternionic CR-submanifolds of paraquaternionic Kähler manifolds.

Integers ${\kappa }_1,...,{\kappa }_N$ are the partial indices of an analytic disc attached to a maximally real submanifolds of ${ℂ}^N$ if and only if ${\kappa }_j\ge 2$ for at least one $j$. If this is the case there are a Lagrangian submanifold $M$ of ${ℂ}^N$ and an analytic disc attached to $M$ with partial indices ${\kappa }^1,...,{\kappa }^N$.

Let D be the unit disc in the complex plane ℂ. Then for every complex linear subspace H in ${ℂ}^n$ of codimension 1, $vo{l}_{2n-2}\left(D^{n-1}\right)\le vo{l}_{2n-2}\left(H\cap D^n\right)\le 2vo{l}_{2n-2}\left(D^{n-1}\right)$. The lower bound is attained if and only if H is orthogonal to the versor $e_j$ of the jth coordinate axis for some j = 1,...,n; the upper bound is attained if and only if H is orthogonal to a vector $e_j+\sigma e_k$ for some 1 ≤ j < k ≤ n and some σ ∈ ℂ with |σ| = 1. We identify ${ℂ}^n$ with ${ℝ}^{2n}$; by $vo{l}_k\left(·\right)$ we denote the usual k-dimensional volume in ${ℝ}^{2n}$. The result is a complex counterpart of Ball’s [B1] result for...

L’étude du « problème de Plateau complexe » (ou « problème du bord ») dans une variété complexe $X$ consiste à caractériser les sous-variétés réelles $\Gamma$ de $X$ qui sont le bord de sous-ensembles analytiques de $X\setminus \Gamma$. Notre principal résultat traite le cas $X=U\times \omega$ où $U$ est une variété complexe connexe et $\omega$ est une variété kählérienne disque convexe. Comme conséquence, nous obtenons des résultats de Harvey-Lawson [19], Dolbeault-Henkin [12] et Dinh [10]. Nous obtenons aussi une généralisation des théorèmes de Hartogs-Levi...

Le but de cet article est de montrer un résultat de prolongement d’un courant positif, défini en dehors d’un obstacle fermé, dont le $d{d}^c$ est dominé par un courant positif fermé de masse localement finie. On étudie divers types d’obstacles  : soit un ensemble fermé pluripolaire complet, soit l’ensemble des zéros d’une fonction strictement $k$-convexe positive. Dans la troisième partie, sous des conditions sur la dimension de Hausdorff de l’obstacle, on démontre le prolongement d’un tel courant. On termine...

We will classify $n$-dimensional real submanifolds in ${ℂ}^n$ which have a set of parabolic complex tangents of real dimension $n-1$. All such submanifolds are equivalent under formal biholomorphisms. We will show that the equivalence classes under convergent local biholomorphisms form a moduli space of infinite dimension. We will also show that there exists an $n$-dimensional submanifold $M$ in ${ℂ}^n$ such that its images under biholomorphisms $(z_1,\cdots ,z_n)\mapsto (r{z}_1,\cdots ,r{z}_{n-1},r^2{z}_n)$, $r\&gt;1$, are not equivalent to $M$ via any local volume-preserving holomorphic...